Oil cracking waste catalyst as an active pozzolanic material for superplasticized mortars

Kung Chung Hsu*, Yun Sheng Tseng, Fan Feng Ku, Nan Su

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)


Superplasticized mortars containing waste catalyst (EPcat) have been characterized. This waste catalyst comes from catalytic crackers of oil companies. It consists mainly of silicon oxide and aluminum oxide, and shows some amorphous structure. Test results indicate that more superplasticizer or water is required for maintaining the workability of mortars incorporating EPcat. Nevertheless, mortars with EPcat exhibit greater compressive strength than those without. The strength improvement could be attributed to high pozzolanic activity of the waste catalyst. One evidence is that earlier temperature rise was observed in EPcat mortars during hydration than plain ones. Besides, the microstructure analysis indicates that both ettringite and monosulfoaluminate were produced in the early curing period of EPcat mortars. These confirm that EPcat could accelerate the cement hydration by inducing a pozzolanic reaction between the catalyst and calcium hydroxide, the cement hydrated product.

Original languageEnglish
Pages (from-to)1815-1820
Number of pages6
JournalCement and Concrete Research
Issue number12
Publication statusPublished - 2001 Dec


  • Compressive strength
  • Mortar
  • Pozzolan
  • Waste catalyst
  • Workability

ASJC Scopus subject areas

  • Building and Construction
  • General Materials Science


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